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【Python】获取网页的正文

作者:余争4 / 发布于2013/8/20/ 692


	# -*- coding=utf-8 -*-
	import sys, os, codecs, re

	reload(sys)
	sys.setdefaultencoding('utf-8')

	import cProfile
	import urllib2

	re_title = re.compile(r'<title>(.*?)</title>', re.I|re.U|re.S)
	re_body = re.compile(r'<body[^>]*>.*</body>', re.I|re.U|re.S)
	re_doc_type = re.compile(r'<!DOCTYPE.*?>', re.I|re.U|re.S)
	re_comment = re.compile(r'<!--.*?-->', re.I|re.U|re.S)
	re_js = re.compile(r'<script.[^>]*>.*?</script>', re.I|re.U|re.S)
	re_css = re.compile(r'<style[^>]*>.*?</style>', re.I|re.U|re.S)
	re_special = re.compile(r'&.{2,8};|&#.{2,8};', re.I|re.U|re.S)
	re_other = re.compile(r'<[^>]*>', re.I|re.U|re.S)

	BLOCK_HEIGHT = 3
	THRESHOLD = 90

	class TextExtract(object):
	 def __init__(self, new_html, join=True):
	 self.html = new_html
	 self.join = join
	 self.text_start = 0
	 self.text_end = 0
	 self.text_body = ''
	 self.block_len = []
	 self.title = ''
	 self.content = ''
	
	 self.extract()

	 def extract(self):
	 self.extract_title()
	 self.extract_body()
	 self.remove_tags()
	 self.extract_text()
	
	 def extract_title(self):
	 m = re_title.search(self.html)
	 if m:
	 self.title = m.group(1)

	 def extract_body(self):
	 m = re_body.search(self.html)
	 if m:
	 self.text_body = m.group()

	 def remove_tags(self):
	 self.text_body = re_doc_type.sub('', self.text_body)
	 self.text_body = re_comment.sub('', self.text_body)
	 self.text_body = re_js.sub('', self.text_body)
	 self.text_body = re_css.sub('', self.text_body)
	 self.text_body = re_special.sub('', self.text_body)
	 self.text_body = re_other.sub('', self.text_body)

	 def extract_text(self):
	 lines = self.text_body.split('\n')
	 line_len = len(lines)
	 for i in xrange(0,line_len,1):
	 lines[i] = re.sub(r'\s+', ' ', lines[i]).strip()
	
	 for i in xrange(1,line_len-1,1):
	 if len(lines[i]) > 0 and len(lines[i]) < 30 and 0 == len(lines[i-1]) and 0 == len(lines[i+1]):
	 lines[i] = ''

	 for i in xrange(0, len(lines)-BLOCK_HEIGHT, 1):
	 line_len = 0
	 for j in xrange(0, BLOCK_HEIGHT, 1):
	 line_len += len(lines[i+j])
	 self.block_len.append(line_len)

	 self.text_start = self.find_text_start(0)
	 self.text_end = 0

	 if(0 == self.text_start):
	 self.content = 'nothing can find'
	 else:
	 if self.join:
	 line_lens = len(lines)
	 while self.text_end < line_lens:
	 self.text_end = self.find_text_end(self.text_start)
	 self.content += self.get_text(lines)
	 self.text_start = self.find_text_start(self.text_end)
	 if 0 == self.text_start:
	 break
	 self.text_end = self.text_start
	 else:
	 self.text_end = self.find_text_end(self.text_start)
	 self.content += self.get_text(lines)

	 def find_text_start(self, index):
	 blk_len = len(self.block_len)
	 for i in xrange(index, blk_len-1, 1):
	 if self.block_len[i] > THRESHOLD and self.block_len[i+1] > 0:
	 return i
	 return 0

	 def find_text_end(self, index):
	 blk_len = len(self.block_len)
	 for i in xrange(index, blk_len-1, 1):
	 if 0== self.block_len[i] and 0== self.block_len[i+1]:
	 return i
	 return blk_len-1

	 def get_text(self, lines):
	 str = ''
	 for i in xrange(self.text_start, self.text_end, 1):
	 str += lines[i]+'\n'
	 return str

	#with codecs.open('/home/yz/download/zzz.html', 'r', 'utf-8') as file:
	# html = file.read()
	# text_extract = TextExtract(html)
	# print text_extract.content

	#text_extract = TextExtract('<html><title>asdfasf</title><body>\nasdfasfd</body></html>')
	#print text_extract.content

	try:
	 url = 'http://www.v-find.com'
	 proxied_request = urllib2.urlopen(url)
	 status_code = proxied_request.code
	 mimetype = proxied_request.headers.typeheader or mimetypes.guess_type(url)
	 content = proxied_request.read()
	 #encoding = proxied_request.headers['content-type'].split('charset=')[-1]
	 #ucontent = unicode(content, encoding)
	 text_extract = TextExtract(content)
	 print text_extract.content

	except urllib2.HTTPError as e:
	 print e

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